Resources: Labels Texts Images

Accumulation of lymphoid cells

• Compound mixed exocrine gland, tubuloacinar. Submandibular salivary gland of rat. HE. x460.

Accumulations of rough endoplasmic reticulum (RER) cisterns

• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).

Accumulations of smooth endoplasmic reticulum tubules

• Steroid-secreting endocrine cells. HPI (x1,150) and MET (x15,000).

Adenomeres

• Reticular stroma. Submandibular salivary gland of rat. Gomori stainig. x460.

Adherens junction

• Terminal bar: adherens junction (oblique section). TEM. x16,300.

Adrenal cortex

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.
• Steroid-secreting endocrine cells. HPI (x1,150) and TEM (x15,000).

Adrenal endocrine cells

• Steroid-secreting endocrine cells. HPI (x1,150) and MET (x15,000).

Adrenal medulla

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.

Afferent (sensory) nerve fibers

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal crest (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Ampullary crest

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal crest (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Anti-Gastrin immunoperoxidase

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Apical border with arranged microvilli

• Arranged microvilli (striated border). Intestinal epithelium of rat. TEM. x20,000 (J. Vaquera, ULE)

Apical keratinocytes

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.

Apical layer

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.

Apical microfolds (respiratory epithelium)

• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Apical pole of epithelium

• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.

Apical pole of enteroendocrine G cell

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Apical pole of enteroendocrine LG cell

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Apical pole parietal cells

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).

Apical pole of the cell

• Striated basal pole. TEM. Distal urinary tubule cell of rat kidney. (Image under licence Creative Commons Public Domain Mark 1.0 from Amano, O. et al., 2012: Acta Histochem Cytochem, 45: 241–250).

Apical pole of the mesothelium

• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Apical pole with acidophilic serous granules

• Tubuloacinar serous adenomeres. Exocrine pancreas of cat. HE. 550x. Exocrine pancreas of cat. HE. x550.

Apical pole with mucous granules

• Mucous acinar adenomeres. Submandibular salivary gland of rat. TrG x1,150.
• Serous and mucous adenomeres (mixed gland). Developing seveloping submandibular salivary gland of rat. TrG. x1,150.
• Simple pluricellular alveolar glands, serous and mucous. Parotid glands of Pelophylax perezi. HPI-Alz. Blue. x460.
• Unicellular mucous glands. Epidermis of Rainbow trout. HE. x500.
• Unicellular mucous glands. Epidermis of Salmo trutta fario. HE-PAS. x750.

Arteriole (CL)

• Endothelium. TEM. x3,000. Thymus arteriole of golden hamster (Mesocricetus auratus).

Axonal branches

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Axoneme

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE)

Basal body (LC)

• Ciliated lining epithelium. Tracheal epithelium of rat (HE, x1,150) and mesothelium of Pleurodeles waltl (TEM, x6,300).

Basal body (CT)

• Ciliated lining epithelium. Tracheal epithelium of rat (HE, x1,150) and mesothelium of Pleurodeles waltl (TEM, x6,300).

Basal epithelial cells

• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.

Basal (germinative) layer

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.
• Epithelial regeneration. Lieberkühn's crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Basement membrane

• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.
• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.
• Simple epithelium with non-chitinized fibrous cuticle. Skin of Lumbricus terrestris. van Gieson. x1,150.
• Simple epithelium with chitinized cuticle. Insect integument. van Gieson. x1,150.
• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.
• Simple cuboidal epithelium with microvilli (brush border). HE. x1,150. Proximal convoluted tubule. Mesonephros of Rainbow trout (O. mykiss)
• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.
• Stratified cuboidal lining epithelium, mucosecretory. Skin of Myxine glutinosa. HE and HPI-Alz. Blue. x230.
• Transitional epithelium. Non-distended urinary bladder of cat. HE. x460.

Basement membrane: PAS-positive

• Simple columnar epithelium with striated border. HE-PAS. x1,150. Intestinal villus of rat.
• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Basal plate

• Ciliated lining epithelium. Tracheal epithelium of rat (HE, x1,150) and mesothelium of Pleurodeles waltl (TEM, x6,300).

Basal pole of epithelium

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. Immunoperoxidase (IP) anti-pankeratin. x500.
• Simple columnar epithelium. Distal convoluted tubule of Rainbow trout (O. mykiss). HE. x1,150.

Basal pole of mucous gland

• Unicellular mucous glands. Branchial epithelium of Rutilus rutilus. TEM. x8,000. (Image by A. G. Zapata, UCM).

Basal (secretory) pole of enteroendocrine cells

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Basal striations

• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.
• Lining epithelium with basal striations. Interlobular striated excretory ducts of rat salivary gland. TrG. x1,150.

Basophilic apical pole of secretory cells

• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Basal perinuclear pole of serous cells

• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).

Basophilic basal perinuclear pole of serous cells

• Tubuloacinar serous adenomeres. Exocrine pancreas of cat. HE. 550x. Exocrine pancreas of cat. HE. x550.

Basophilic perinuclear region of endocrine cells

• Langerhans islet. Cat pancreas. HE. x640.

Birbeck granules

• Interdigitating Langerhans-type dendritic cell. TEM. x3,500. Inset: Birbeck granules. TEM. x35,000. Pharyngeal epithelium of thyme in trout Salmo trutta fario. (image by F. Álvarez, ULE).

Blood capillaries

• Endocrine follicles. Rat thyroid. HE. x450.
• Endocrine steroid-secreting cells. HPI (x1,150) and MET (x15.000).
• Langerhans islet. Cat pancreas. HE. x640.
• Lining epithelium with basal striation. Interlobular striated excretory ducts of rat salivary gland. TrG. x1,150.
• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Blood capillary endothelium

• Detail of granules from an endocrine β-cell of Pelophylax perezi pancreas. TEM. x13,400. (Image provided by R.M. Pérez Gomariz, UCM).

Blood sinusoids

• Interrenal endocrine tissue. Pronephros of Brown trout, Salmo trutta fario. CSF. Toluidine blue. x480. Inset: HPI. x120.

Blood vessels

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.
• Multicellular serous gland. Cat pancreas. HE. x325.
• Tadpole intestine of P. perezi. van Gieson stain. x460. Cat pancreas. HE. x460.
• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Body cavity

• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Branches of intracellular canaliculi

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).

Brush border

• Simple cuboidal epithelium with microvilli (brush border). HE. x1,150. Proximal convoluted tubule. Rainbow trout mesonephros (O. mykiss)

Bundles of collagen fibers

• Stratified cornified epithelium with horny scales. Integument of Lacerta lepida. HPI. x450.

Cartilage

• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.

Central microtubules

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE).
• Ciliated lining epithelium. Rat tracheal epithelium (HE, x1,150) and pleurodeles mesothelium (TEM, x6,300).

Chromaffin cells

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.

Cilia

• Ciliated pseudostratified epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Ciliated lining epithelium. Tracheal epithelium of rat (HE, x1,150) and mesothelium of Pleurodeles waltl (TEM, x6.300).
• Single-layered columnar lining epithelium with cilia and mucous secretion. Dorsal epithelium of the typhlosole of Lumbricus terrestris. HPI-Alz. Blue. x1,150.

Ciliary roots

• Ciliated lining epithelium. Rat tracheal epithelium (HE, x1,150) and Pleurodeles waltl mesothelium (TEM, x6,300).

Ciliated border

• Ciliated lining epithelium. Tracheal epithelium of rat (HE, x1,150) and mesothelium of Pleurodeles waltl (MET, x6,300).
• Ciliated pseudostratified epithelium. Nasal epithelium of frog (P. perezi). Al. Blue. x1,150.
• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.
• Simple ciliated mucous-secreting columnar lining epithelium. Dorsal epithelium of typhlosole of Lumbricus terrestris. Al. Blue. x1,150.

Ciliated epithelial cells

• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.

Ciliated Mucous-secretory lining epithelial cells

• Simple ciliated mucous-secretory columnar lining epithelium Dorsal epithelium of tiflosole of Lumbricus terrestris. HPI-Al. Blue. x1,150.

Ciliated mucous-secreting simple prismatic epithelium

• Simple prismatic lining epithelium, ciliated secretory. Dorsal epithelium of the typhlosole of Lumbricus terrestris. HPI-Al. Blue. x1,150.

Ciliated seudostratified columnar epithelium

• Ciliated lining epithelium. Rat tracheal epithelium (HE, x1,150) and Pleurodeles waltl mesothelium (MET, x6,300).

Closed mucous pole

• Closed mucous pole of simple columnar epithelium. Superficial gastric mucosa of toad (Bufo bufo). x1,150.
• Glándulas tubulares simples: Mucosa gástrica de rata. HE. x200.

Connective tissue

• Epithelial regeneration. Cat Lieberkühn crypts (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).
• Simple epithelium with non-chitinous fibrous cuticle. Earthworm (Lumbricus terrestris) tegument. van Gieson stain. x1,150.
• Simple pluricellular alveolar mucous glands. Skin of Pelophylax perezi. HPI-Alz. Blue. x460.
• Tadpole intestine (P. perezi). van Gieson stain. x460. Cat pancreas. HE. x460.

Connective tissue capsule

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.
• Mucous acinar adenomeres. Rat submandibular salivary gland. TrG x1,150.
• Reticular stroma. Rat submandibular salivary gland. Gomori. x460.

Connective tissue stroma

• Endocrine follicles. Rat thyroid gland. HE. x450.

Colloid

• Endocrine follicles. Rat thyroid. HE. x450.

Cords of interrenal tissue

• Interrenal endocrine tissue. Pronephros of Brown trout, Salmo trutta fario. CSF. Toluidine blue. x480. Inset: HPI. x120.

Cornified apical layer

• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Cornified / horny scales

• Stratified cornified epithelium with horny scales. Integument of Lacerta lepida. HPI. x450.
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Corticosteroid-secreting cells

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.

Cuboidal simple epithelium of external root sheath

• Epithelial regeneration. Lieberkühn's crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Cuboidal simple epithelium of Lieberkühn crypt

• Epithelial regeneration. Lieberkühn's crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Cuboidal simple epithelium with basal striations

• Lining epithelium with basal striations. Interlobular striated excretory ducts of rat salivary gland. TrG. x1,150.
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.

Cuticuled simple prismatic epithelium

• Simple epithelium with chitinous cuticle. Insect tegument. van Gieson. x1,150.

Dendritic cell branches

• Interdigitating Langerhans-type dendritic cell. TEM. x3,500. Inset: Birbeck granules. TEM. x35,000. Pharyngeal epithelium of Salmo trutta fario thymus (image by F. Álvarez, ULE).

Dense irregular connective tissue

• Lining epithelium with basal striation. Interlobular striated excretory ducts of rat salivary gland. HE. x1,150.
• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.

Dermal papilla of hair bulb

• Epithelial regeneration. Cat Lieberkühn crypts (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Dermis

• Simple alveolar, mucous multicellular glands. Tegument of Pelophylax perezi. HPI-Alz. Blue. x460.
• Simple alveolar, serous, and mucous multicellular glands. Parotid glands of Pelophylax perezi HPI-Alz. Blue. x460.
• Stratified cornified epithelium with horny scales. Integument of Lacerta lepida. HPI. x450.

Dermis (connective tissue)

• Mioepithelial cells of mucous multicellular gland. TEM. 3,300x. Tegument of Pelophylax perezi.
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Dermis (dense irregular connective tissue)

• Sebaceous gland. Human hairy skin. HE. x1,150.
• Stratified cuboidal lining epithelium, mucosecretory. Tegument of Myxine glutinosa. HE and HPI-Alz. Blue. x230.

Dermis (loose connective tissue)

• Simple cuboidal epithelium with mucous cuticle. Cephalic tegument of snail (Helix sp.). HPI-Alz. Blue. x460.

Desmosomes

• Ciliated lining epithelium. Tracheal epithelium of rat (HE, x1,150) and mesothelium of Pleurodeles waltl (TEM, x6,300).
• Desmosomes between keratinocytes. x33,000. Epidermis of Pelophylax perezi.
• Unicellular mucous glands. Gill epithelium of Rutilus rutilus. TEM. x8,000
• Terminal bar: desmosome junction (oblique section). TEM. x16,300.

Differentiating keratinocytes

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.

Dynein arms

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE)

Endocrine cells (Langerhans islet)

• Langerhans islet. Cat pancreas. HE. x640.

Endocrine gland: Endocrine pancreas

• Cat pancreas. HE. x460.

Endocrine secretory granules

• Detail of granules from an endocrine β-cell of Pelophylax perezi pancreas. TEM. x13,400. (Image provided by R.M. Pérez Gomariz, UCM).

Endocuticle

• Simple epithelium with chitinous endocuticle. Insect tegument. van Gieson. x1,150.

Endothelium

• Endothelium. HE. x1,150. Rainbow trout vein (O. mykiss).
• Endothelium. TEM. x3,000. Arteriole from golden hamster thymus (Mesocricetus auratus).

Enteroendocrine G cell

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Enteroendocrine LG cell

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Epicuticle

• Simple epithelium with chitinous epicuticle. Insect tegument. van Gieson. x1,150.

Epidermis: stratified cuboidal mucous-secreting epithelium

• Stratified cuboidal lining epithelium, mucosecretory. Tegument of Myxine glutinosa. HE and HPI-Alz. Blue. x230.

Epidermis: Stratified squamous epithelium

• Simple alveolar, mucous multicellular glands. Tegument of Pelophylax perezi. HPI-Alz. Blue. x460.
• Simple alveolar, serous, and mucous multicellular glands. Parotid glands of Pelophylax perezi HPI-Alz. Blue. x460.

Epidermis: Stratified squamous keratinized (cornified) epithelium

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).
• Stratified cornified epithelium with horny scales. Integument of Lacerta lepida. HPI. x450.
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Epithelial apical cells (transitional epithelium)

• Transitional epithelium. Non-distended urinary bladder of cat. HE. x460.

Epithelial basal cells (transitional epithelium)

• Transitional epithelium. Non-distended urinary bladder of cat. HE. x460.

Epithelial cell in mitosis

• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Epithelial cells with basal striations

• Lining epithelium with basal striation. Interlobular striated excretory ducts of rat salivary gland. TrG. x1,150.

Epithelial cells with microvilli

• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.

Epithelial cells with mucous apical pole (faveolar cells)

• Simple columnar epithelium with closed mucous pole. Superficial gastric mucosa of toad (Bufo bufo) x1,150.

Epithelial cells without microvilli

• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.

Epithelial lining cells

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Erythrocytes: anucleated

• Tubular serous adenomeres. Rat salivary gland. TrG. 1,150x.
• Endothelium. TEM. x3,000. Arteriole of golden hamster thymus (Mesocricetus auratus).

Erythrocytes: nucleated

• Endothelium. HE. x1,150. Rainbow trout vein (O. mykiss).
• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).
• Ciliated pseudostratified epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.

Evaginations of the mucous gland

• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.

Excretory ducts

• Ciliated pseudostratified epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Serous multicellular gland. Cat pancreas. HE. x325.
• Simple alveolar, serous, and mucous multicellular glands. Parotid glands of Pelophylax perezi HPI-Alz. Blue. x460.
• Simple multicellular glands, mucous alveolar. Tegument of Pelophylax perezi. HPI-Alz. Blue. x460.
• Tubular serous adenomeres. Salivary gland of rat. TrG. 1,150x.
• Tubuloacinar serous adenomeres. Exocrine pancreas of cat. HE. 550x. Exocrine pancreas of cat. HE. x550.

Excretory pores

• Simple pluricellular alveolar mucous glands. Skin of Pelophylax perezi. HPI-Alz. Blue. x460.

Exocrine gland: Exocrine pancreas

• Cat pancreas. HE. x460.

Exocrine pancreatic adenomeres

• Langerhans islet. Cat pancreas. HE. x640.
• Serous multicellular gland. Cat pancreas. HE. x325.

Exocuticle

• Simple epithelium with chitinous cuticle. Insect tegument. van Gieson. x1,150.

Exocytosis

• Detail of granules from an endocrine β-cell of Pelophylax perezi pancreas. TEM. x13,400. (Image provided by R.M. Pérez Gomariz, UCM).

Extracellular matrix

• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Fibroblasts

• Ciliated pseudostratified epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. T. Blue. x1,150.
• Langerhans islet. Cat pancreas. HE. x640.
• Mucous acinar adenomeres. Submandibular salivary gland of rat. TrG x1,150.
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Fibrous cuticle

• Simple epithelium with non-chitinous fibrous cuticle. Tegument of Lumbricus terrestris. van Gieson. x1,150.

Filament cells

• Stratified cuboidal lining epithelium, mucosecretory. Skin of Myxine glutinosa. HE and HPI-Alz. Blue. x230.

Flagellum

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE)

Follicular cells

• Endocrine follicles. Rat thyroid. HE. x450.

Follicular epithelium

• Endocrine follicles. Rat thyroid. HE. x450.

Fundic glands

• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Fundic gland lumina

• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Fundic gland opening to pit

• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Gap junction

• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Gastric epithelial lining cells

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Gastric epithelium

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Gastric lamina propia

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Gastric pits

• Simple columnar epithelium of closed mucous pole. Superficial gastric mucosa of toad (Bufo bufo) x1,150.
• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Germinal keratinocytes

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.

Gill filaments

• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Gland lobes

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Gland lobe with mixed and serous adenomeres

• Glandular lobes and lobules. Salivary gland of rat. TrG. x115.

Gland lobe with mucous adenomeres

• Glandular lobes and lobules. Salivary gland of rat. TrG. x115.

Gland lobules

• Glandular lobes and lobules. Salivary gland of rat. TrG. x115.

Glisson's capsule

• Mesothelium. Porcine liver. TrG. x950.

Granular layer

• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Glycocalyx

• Glycocalyx: Intestinal epithelium of tadpole (P. perezi)
• Glycocalyx and tight junction: Pharyngeal epithelium of trout O. mykiss. TEM. Ruthenium red stain. x80,000
• Ordered microvilli (striated border). Intestinal epithelium of rat. TEM. x20,000 (J. Vaquera, ULE)

Goblet cells

• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. Toluidine blue. x1,150.
• Simple columnar epithelium with striated border. HE. Cat duodenum. x1.260.
• Simple columnar epithelium with striated border and goblet cells. HPI-Alz. Blue. x1,150.
• Simple columnar epithelium with striated border. HE-PAS. x1,150. Intestinal villus of rat.
• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Golgi apparatus dictyosomes

• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).
• Unicellular mucous glands. Gill epithelium of Rutilus rutilus. TEM. x8,000

Gustatory pores

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Hair bulb (CL)

• Epithelial regeneration. Lieberkühn's crypts in cat (HE, x580), human hair follicle (HE, x390), and cat taste bud (HE, x370).

Hair follicle

• Sebaceous gland. Human pilosebaceous skin. HE. x1,150.

Hematopoietic tissue

• Interrenal endocrine tissue. Pronephros of Brown trout, Salmo trutta fario. CSF. Toluidine blue. x480. Inset: HPI. x120.

Hemidesmosomes

• Hemidesmosomes in an epithelial cell. Mouse trachea. TEM.

Hemocoel cavity

• Simple epithelium with chitinized cuticle. Insect integument. van Gieson. x1,150.

Hemolymphatic sinusoids

• Simple cuboidal epithelium with mucous cuticle. Head tegument of snail (Helix sp.). HPI-Alz. Blue. x460.

Hemolymphatic vessel

• Simple cuboidal epithelium with mucous cuticle. Head tegument of snail (Helix sp.). HPI-Alz. Blue. x460.

Hepatic parenchyma

• Mesothelium. Porcine liver. TrG. x950.

Hypodermis

• Simple epithelium with chitinous cuticle. Insect integument. Van Gieson. x1,150.

Inmature goblet cells

• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. Toluidine blue. x1,150.

Inmature mucous cells

• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.

Infoldings of the cell membrane

• Striated basal pole. TEM. Distal urinary tubule cell of rat kidney. (Image under licence Creative Commons Public Domain Mark 1.0 from Amano, O. et al., 2012: Acta Histochem Cytochem, 45: 241–250).

Inmature sebaceous cells

• Sebaceous gland. Human hairy skin. HE. x1,150.

Intercalated duct epithelial cells

• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.

Intercellular matrix

• Hemidesmosomes in an epithelial cell. Mouse trachea. TEM.

Intercellular space

• Glycocalyx and tight junction: Pharyngeal epithelium of Rainbow trout O. mykiss. TEM-Ruthenium red. x80,000
• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.

Intercellular spaces with desmosomes

• Desmosomes between keratinocytes. x33,000. Skin of Pelophylax perezi.

Intercellular spines (desmosomes)

• Desmosomes between keratinocytes by light microscopy (HPI, x1,150) and TEM (x33,000).
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Interdigitations

• Glycocalyx and tight junction: Pharyngeal epithelium of trout O. mykiss. TEM-Ruthenium red. x80,000
• Desmosomes between keratinocytes. x33,000. Epidermis of Pelophylax perezi.

Interdigitating dendritic cell

• Interdigitating Langerhans-like dendritic cell. TEM. x3.500. Inset: Birbeck granules. TEM. x35,000. Pharyngeal epithelium of trout Salmo trutta fario (image by F. Álvarez, ULE).

Interlobular arteriole

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Interlobular excretory duct

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Interlobular septa

• Glandular lobes and lobules. Rat salivary gland. HE. x115.

Interlobular septum

• Glandular lobes and lobules. Rat salivary gland. HE. x115.
• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Interlobulillar excretory duct (TS)

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Interlobulillar septa (LS)

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Interlobulillar septum (TS)

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Interlobulillar venule

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Intermediate layer

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.

Interrenal cells

• Steroid-secreting endocrine cells. HPI (x1,150) and MET (x15,000).

Interrenal endocrine cells

• Interrenal endocrine tissue. Pronephros of Brown trout, Salmo trutta fario. CSF. Toluidine blue. x480. Inset: HPI. x120.

Intestinal lamina propria

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).
• Epithelial regeneration. Lieberkühn crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Intestinal lining epithelium

• Intestine of tadpole (P. perezi). van Gieson. x460. Cat pancreas. HE. x460.

Intestinal lumen

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).
• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. T. Blue. x1,150.
• Ordered microvilli (brush border). Intestinal epithelium of rat. TEM. x20,000 (J. Vaquera, ULE)
• Simple columnar epithelium with striated border and goblet cells. HPI-Al. Blue. x1,150.
• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Intimal tunica (connective tissue)

• Endothelium. TEM. x3,000. Arteriole of golden hamster thymus (Mesocricetus auratus).

Intracellular canaliculi (TS)

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).

Intraepithelial lymphocytes

• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.
• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.
• Simple columnar epithelium with striated border. HE-PAS. x1,150. Intestinal villus of rat.
• Simple columnar epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.
• Simple columnar epithelium with striated border. HE. x1,260. Cat duodenum.

Intraepithelial macrophages

• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. T. Blue. x1,150.

Intralobular loose connective tissue

• Compound mixed exocrine gland, tubuloacinar. Rat submandibular salivary gland. HE. x460.

Intralobular septa

• Glandular lobes and lobules. Rat salivary gland. HE. x115.
• Reticular stroma. Submandibular salivary gland of rat. Gomori stain. x460.

Intralobulillary excretory ducts

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.
• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Intralobulillary excretory ducts: detail

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Intralobulillary loose connective tissue

• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Keratinocytes

• Desmosomes between keratinocytes by light microscopy (HPI, x1,150) and TEM (x33,000).
• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Lamina densa

• Endothelium. TEM. x3,000. Arteriole in the thymus of golden hamster (Mesocricetus auratus).
• Hemidesmosomes in an epithelial cell. Mouse trachea. TEM.
• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.
• Mioepithelial cells of mucous multicellular gland. TEM. 3,300x. Skin of Pelophylax perezi.
• Striated basal pole. TEM. Distal urinary tubule cell of rat kidney. (Image under licence Creative Commons Public Domain Mark 1.0 from Amano, O. et al., 2012: Acta Histochem Cytochem, 45: 241–250).

Lamina lucida

• Hemidesmosomes in an epithelial cell. Mouse trachea. TEM.
• Mioepithelial cells of mucous multicellular gland. TEM. 3,300x. Skin of Pelophylax perezi.

Lamina propria: connective tissue

• Intraepithelial macrophages. Lieberkühn crypts of rat. CSF. Toluidine blue. x1,150.
• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Al. Blue. x1,150.
• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.
• Simple columnar epithelium, ciliated secretory. Dorsal epithelium of the typhlosole of Lumbricus terrestris. HPI-Al. Blue. x1,150.
• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.
• Simple tubular glands: Gastric mucosa of rat. HE. x200.
• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.
• Simple columnar epithelium with closed mucous pole. Surface gastric mucosa of toad (Bufo bufo) x1,150.
• Simple columnar epithelium with striated border and goblet cells. HPI-Al. Blue. x1,150.
• Simple columnar epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.
• Simple columnar epithelium with striated border. HE-PAS. x1,150. Intestinal villus of rat.
• Tadpole intestine (P. perezi). Van Gieson. x460.
• Transitional epithelium. Undistended urinary bladder of cat. HE. x460.

Lamina propria of gill filaments

• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Lateral labyrinth

• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.

Lieberkühn crypt (LS)

• Epithelial regeneration. Lieberkühn crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Lieberkühn's crypt lumina

• Epithelial regeneration. Lieberkühn's crypts in cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Lingual lamina propria

• Epithelial regeneration. Lieberkühn crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Lining epithelial cells

• Simple columnar epithelium with striated border. HE. x1,260. Cat duodenum.
• Simple columnar epithelium with striated border. HE-PAS. x1,150. Intestinal villus of rat.
• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.
• Simple cuboidal epithelium with microvilli (brush border). HE. x1,150. Proximal convoluted tubule. Rainbow trout mesonephros (O. mykiss).
• Simple epithelium with non-chitinous fibrous cuticle. Skin of Lumbricus terrestris. van Gieson. x1,150.

Lipid droplets

• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).
• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.
• Steroid-secreting endocrine cells. HPI (x1,150) and TEM (x15,000).

Lipid droplets in the adrenocortical cells

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.

Lipid droplets in the interrenal endocrine cells

• Interrenal endocrine tissue. Pronephros of Brown trout, Salmo trutta fario. CSF. Toluidine blue. x480. Inset: HPI. x120.

Lobules with mixed adenomeres

• Lobes, lobules and excretory ducts of a compound exocrine gland. Submandibular salivary gland of rat. HE. x70.

Loose connective tissue

• Serous tubuloacinar adenomeres. Exocrine pancreas of cat. HE. x550.

Lumen of intracellular canaliculi

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).

Lymphatic capillary

• Simple columnar epithelium with striated border. HE. Cat duodenum. x1.260
• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. Toluidine blue. x1,150.

Lymphocytes in the lamina propria

• Simple columnar epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Mammary adenomeres (tubuloacinars)

• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Mammary adenomer lumen

• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Mammary secretory cells

• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.

Mature sebaceous cells

• Sebaceous gland. Human hairy skin. HE. x1,150.

Melanocyte ramifications in the epidermis

• Stratified cornified epithelium with horny scales. Integument of Lacerta lepida. HPI. x450.

Melanomacrophages

• Simple cuboidal epithelium with microvilli (brush border). HE. x1,150. Proximal convoluted tubule. Mesonephros of Rainbow trout (O. mykiss)

Merkel cella

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal crest (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Mesothelium

• Mesothelium. Porcine liver. TrG x950.
• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Microfilament bundles

• Ordered microvilli (striated border). Intestinal epithelium of rat. TEM. x20,000 (J. Vaquera, ULE)

Microvilli (CL)

• Ordered microvilli (striated border). Rat intestinal epithelium. TEM. x20,000 (J. Vaquera, ULE)

Mitochondria

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).
• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.
• Ordered microvilli (striated border). Rat intestinal epithelium. TEM. x20,000 (J. Vaquera, ULE)
• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).
• Striated basal pole. TEM. Distal urinary tubule cell of rat kidney. (Image under licence Creative Commons Public Domain Mark 1.0 from Amano, O. et al., 2012: Acta Histochem Cytochem, 45: 241–250).

Mitochondria with tubular cristae

• Steroid-secreting endocrine cells. HPI (x1,150) and TEM (x15,000).

Mitosis in intestinal epithelium

• Tadpole intestine (P. perezi). van Gieson. x460. Cat pancreas. HE. x460.

Mitotic Cell in intrapapillary epithelium

• Epithelial regeneration. Lieberkühn's crypts in cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Mitotic cell in germinal layer

• Epithelial regeneration. Lieberkühn's crypts in cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Mitotic cells in Lieberkühn crypt epithelium

• Epithelial regeneration. Lieberkühn's crypts in cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).

Mixed tubuloacinar adenomeres

• Compound mixed exocrine gland, tubuloacinar. Submandibular salivary gland of rat. HE. x460.

Monocyte

• Endothelium. TEM. x3,000. Arteriole of golden hamster thymus (Mesocricetus auratus).

Mucous acinar adenomeres

• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.
• Mucous acinar adenomeres. Submandibular salivary gland of rat. HE x1,150.

Mucosa (mucous epithelium plus lamina propria)

• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.

Mucous apical border

• Simple closed mucous-pole columnar epithelium. Surface gastric mucosa of toad (Bufo bufo) HE. x1,150.
• Simple ciliated mucous-secreting columnar lining epithelium. Dorsal epithelium of typhlosole of Lumbricus terrestris. Alcian Blue. x1,150.
• Stratified cuboidal lining epithelium, mucous-secreting. Tegument of Myxine glutinosa. HE and Alcian Blue. x230.

Mucous cells

• Myoepithelial cells of mucous multicellular gland. TEM. 3,300x. Skin of Pelophylax perezi.
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.

Mucous cuticle

• Simple alveolar, mucous multicellular glands. Tegument of Pelophylax perezi. HPI-Alz. Blue. x460.
• Simple cuboidal epithelium with mucous cuticle. Cephalic tegument of snail (Helix sp.). HPI-Alz. Blue. x460.

Mucous gland lumina

• Simple alveolar, serous, and mucous multicellular glands. Parotid glands of Pelophylax perezi. HPI-Al. Blue. x460.

Mucous granules

• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.
• Mucous unicellular glands. Gill epithelium of Rutilus rutilus. TEM. x8,000

Mucous neck cells

• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Mucous-secreting cells of the intermediate layer

• Stratified cuboidal lining epithelium, mucosecretory. Skin of Myxine glutinosa. HE and HPI-Alz. Blue. x230.

Mucous secretion

• Compound mixed exocrine gland, tubuloacinar. Submandibular salivary gland of rat. HE. x460.
• Simple pluricellular alveolar mucous glands. Skin of Pelophylax perezi. HPI-Alz. Blue. x460.
• Simple columnar epithelium with striated border. HE. x1,260. Cat duodenum.
• Simple columnar epithelium with striated border and goblet cells. HPI-Alz. Blue. x1,150.

Myoepithelial cells

• Myoepithelial cells of mucous multicellular gland. TEM. 3,300x. Skin of Pelophylax perezi.
• Serous and lipid secretion adenomeres. Active human mammary gland. HE. x450.
• Simple alveolar mucous, serous, and mucous multicellular glands. Parotid glands of Pelophylax perezi. HPI-Alz. Blue. x460.

Nerve

• Adrenal (suprarenal) gland of cat: Overview (x55) and detail of the corticomedullary junction (x350). HE.

Nuclei of adrenal cells

• Steroid-secreting endocrine cells. HPI (x1,150) and TEM (x15,000).

Nuclei of caliciform cella

• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.
• Simple columnar epithelium with striated border and goblet cells. HE-Alz. Blue. x1,150.

Nuclei of ciliated mucous cells

• Simple ciliated mucous-secretory columnar lining epithelium. Dorsal epithelium of typhlosole of Lumbricus terrestris. HPI-Alz. Blue. x1,150.

Nuclei of endocrine cells (Langerhans islet)

• Langerhans islet. Cat pancreas. HE. x640.

Nuclei of endothelial cells

• Endothelium. HE. x1,150. Rainbow trout vein (O. mykiss).
• Endothelium. TEM. x3,000. Arteriole of golden hamster thymus (Mesocricetus auratus).

Nuclei of fibroblasts

• Mesothelium. Porcine liver. TrG. x950.
• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Al. Blue. x1,150.
• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.
• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.
• Transition epithelium. Non-distended urinary bladder of cat. HE. x460.

Nuclei of gustatory sensory cells

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Nuclei of keratinocytes

• Desmosomes between keratinocytes by light microscopy (HPI, x1,150) and TEM (x33,000).
• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Nuclei of interrenal endocrine cells

• Interrenal endocrine tissue. Pronephros of Brown trout, Salmo trutta fario. CSF. Toluidine blue. x480. Inset: HPI. x120.

Nuclei of lining epithelial cells

• Closed mucous pole simple columnar epithelium. Surface gastric mucosa of toad (Bufo bufo) x1,150.
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.
• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.
• Simple columnar epithelium with striated border and goblet cells. HPI-Alz. Blue. x1,150.
• Simple epithelium with chitinous cuticle. Insect tegument. van Gieson. x1,150.
• Simple epithelium with non-chitinous fibrous cuticle. Earthworm tegument (Lumbricus terrestris). van Gieson. x1,150.
• Simple columnar epithelium with striated border. HE. x1,260. Cat duodenum.
• Simple columnar epithelium with striated border. HE-PAS. x1,150. Rat intestinal villus.
• Simple cuboidal epithelium with mucous cuticle. Cephalic tegument of snail (Helix sp.). HPI-Alz. Blue. x460.
• Simple cuboidal epithelium with microvilli (brush border). HE. x1,150. Proximal convoluted tubule. Rainbow trout mesonephros (O. mykiss)
• Simple columnar lining epithelium with striated border. HE-PAS. x1,150. Rat intestinal villi.
• Striated basal epithelium. Interlobular striated excretory ducts of rat salivary gland. TrG. x1,150.
• Transitional epithelium. Non-distended cat urinary bladder. HE. x460.

Nuclei of mesothelial cells

• Mesothelium. Porcine liver. TrG. x950.

Nuclei of mucous cells

• Mucous acinar adenomeres. Submandibular salivary gland of rat. TrG x1,150.
• Simple epithelium with non-chitinous fibrous cuticle. Earthworm tegument (Lumbricus terrestris). van Gieson. x1,150.
• Simple pluricellular glands, mucous alveolar. Skin of Pelophylax perezi. HPI-Alz. Blue. x460.
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG x1,150.
• Simple pluricellular alveolar glands, serous and mucous. Parotid glands of Pelophylax perezi HPI-Alz. Blue. x460.

Nuclei of parietal cells

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).

Nuclei of sebaceous cells

• Sebaceous gland. Human pilose skin. HE. x1,150.

Nuclei of serous cells

• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG x1,150.
• Simple pluricellular alveolar glands, serous and mucous. Parotid glands of Pelophylax perezi. HPI-Alz. Blue. x460.
• Tubular serous adenomeres. Rat salivary gland. TrG. 1,150x.
• Tubuloacinar serous adenomeres. Exocrine pancreas of cat. HE. 550x.

Nuclei of smooth muscle cell

• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.

Nuclei of vestibular sensory cells

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Nucleus of enteroendocrine LG cell

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Nasal epithelium

• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Overlapping mesothelial cell processes

• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Pair of central microtubules

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE)

Pairs of peripheral microtubules

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE)

Parafollicular (C) cells

• Endocrine follicles. Rat thyroid. HE. x450.

Parietal (oxyntic) cells

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).
• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Parietal muscular tunica (smooth muscle)

• Simple cuboidal epithelium with mucous cuticle. Head tegument of snail (Helix sp.). HPI-Alz. Blue. x460.
• Simple epithelium with non-chitinous fibrous cuticle. Earthworm (Lumbricus terrestris) tegument. van Gieson stain. x1,150.

PAS-Positive goblet cells

• Simple columnar epithelium with striated border. HE-PAS. x1,150. Intestinal villus of rat.
• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

PAS-positive mucous

• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Peripheral microtubules

• Axoneme: cross-sectional structure. TEM. x70,000. (M. Paz Herráez, ULE).
• Ciliated lining epithelium. Rat tracheal epithelium (HE, x1,150) and pleurodeles mesothelium (TEM, x6,300).

Pharynx lumen

• Glycocalyx and tight junctions: Pharyngeal epithelium of trout O. mykiss. Ruthenium red staining. x80,000

Pigment cells

• Simple alveolar mucous glands. Skin of Pelophylax perezi. HPI-Alz. Blue. x460.

Pigment cells (melanocytes)

• Simple alveolar mucous, serous, and mucous multicellular glands. Parotid glands of Pelophylax perezi. HPI-Alz. Blue. x460.
• Stratified cornified epithelium with horny scales. Integument of Lacerta lepida. HPI. x450.

Pigment granules (melanin)

• Mioepithelial cells of mucous multicellular gland. TEM. 3,300x. Skin of Pelophylax perezi.

Pillar cells (branchial filaments)

• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Pore channels

• Simple epithelium with chitinous cuticle. Insect tegument. van Gieson. x1,150.

Plasma cells

• Simple columnar epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Pluricellular mucous glands

• Simple cuboidal epithelium with mucous cuticle. Cephalic tegument of snail (Helix sp.). HPI-Al. Blue. x460.

Prismatic simple epithelium

• Prismatic simple epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.

Prismatic simple epithelium with closed mucous pole

• Simple ciliated mucous-secretory columnar lining epithelium. Dorsal typhlosole epithelium of Lumbricus terrestris. HPI-Al. Blue. x1,150.
• Simple tubular glands: Gastric mucosa of rat. HE. x200.
• Prismatic simple epithelium with closed mucous pole. Surface gastric mucosa of toad (Bufo bufo) x1,150.

Prismatic simple epithelium with PAS-positive border

• Prismatic simple epithelium with striated border. HE-PAS. x1,150. Rat intestinal villus.
• Prismatic simple lining epithelium with PAS-positive border. Rat intestinal villi. HE-PAS. x1,150.

Prismatic simple epithelium with striated border

• Epithelium with striated border and goblet cells. Cat duodenum. HPI-Alz. Blue. x1,150.
• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. T. Blue. x1,150.
• Prismatic simple epithelium with striated border. HE. x1,260. Cat duodenum.

Pseudostratified epithelium

• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Pseudostratified columnar cilated epithelium. Cat trachea. HE. x850.

Queratohyaline granules

• Stratified squamous keratinized epithelium: Keratinization. HE. Human skin. x850.

Renal hematopoietic interstitial tissue

• Simple cuboidal epithelium with microvilli (brush border). Proximal convoluted tubule. Rainbow trout mesonephros (O. mykiss) HE. x1,150.
• Simple columnar epithelium. Distal convoluted tubule of trout (O. mykiss). HE. x1,150.

Renal tubule

• Simple cuboidal epithelium with microvilli (brush border). Proximal convoluted tubule. Rainbow trout mesonephros (O. mykiss) HE. x1,150.

Renal tubule lumina

• Simple cuboidal epithelium with microvilli (brush border). Proximal convoluted tubule. Mesonephros of Rainbow trout (O. mykiss) HE. x1,150.

Residual body

• Intraepithelial macrophages. Rat Lieberkühn's crypt. CSF. T. Blue. x1,150.

Reticular fibers

• Reticular stroma. Submandibular salivary gland of rat. Gomori. x460.
• Reticular stroma. Submandibular salivary gland of rat. Gomori. x460.

Rough endoplasmic reticulum cisterns

• Mucous unicellular glands. Gill epithelium of Rutilus rutilus. TEM. x8,000

Sebaceous gland

• Sebaceous gland. Human pilosebaceous skin. HE. x1,150.

Secretory granules

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).
• Mioepithelial cells of mucous multicellular gland. TEM. 3,300x. Skin of Pelophylax perezi.
• Simple columnar epithelium with striated border and goblet cells. HPI-Al. Blue. x1,150.

Sensory neurons

• Sensorial epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Serous adenomeres

• Cat pancreas. HE. x460.
• Serous multicellular gland. Cat pancreas. HE. x325.

Serous adenomer lumina

• Tubuloacinar serous adenomeres. Exocrine pancreas of cat. HE. 550x. Exocrine pancreas of cat. HE. x550.

Serous cells

• Multicellular serous gland. Cat pancreas. HE. x325.
• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Serous demilunes (von Ebner / Gianuzzi)

• Compound mixed exocrine gland, tubuloacinar. Submandibular salivary gland of rat. HE. x460.

Serous gland lobule

• Serous pluricellular gland. Cat pancreas. HE. x325.

Serous granules

• Pancreatic acinar cell. Exocrine pancreas of Pleurodeles waltl. TEM. x6,000. (Image by R.M. Pérez Gomariz, Bioimágenes, UCM).
• Simple alveolar mucous, serous, and mucous glands. Parotid glands of Pelophylax perezi. HPI-Al. Blue. x460.

Serous tubular adenomeres

• Compound mixed exocrine gland, tubuloacinar. Submandibular salivary gland of rat. HE. x460.
• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.
• Tubular serous adenomeres (CL). Salivary gland of rat. HE. 1,150x.
• Tubular serous adenomeres. Salivary gland of rat. HE. 1,150x. (CT)

Shed epithelial cells

• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.

Simple alveolar mucous glands

• Simple alveolar mucous glands. Skin of Pelophylax perezi. HPI-Al. Blue. x460.
• Simple alveolar mucous and serous glands. Parotid glands of Pelophylax perezi. HPI-Al. Blue. x460.

Simple alveolar serous glands

• Simple alveolar serous glands. Parotid glands of Pelophylax perezi. HPI-Al. Blue. x460.

Simple columnar epithelium with stereocilia

• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.

Simple cuticulated epithelium

• Simple epithelium with non-chitinous fibrous cuticle. Tegument of Lumbricus terrestris. van Gieson. x1,150.

Simple squamous epithelium

• Ciliated lining epithelium. Rat tracheal epithelium (HE, x1,150) and Pleurodeles waltl mesothelium (MET, x6,300).

Simple squamous branchial pithelium with microfolds

• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Simple squamous respiratory epithelium with microfolds

• Simple squamous respiratory epithelium with microfolds. CSF. T. Blue. x1,150. Inset: Simple squamous branchial epithelium. MET. x1,600. Gill filaments of O. mykiss. Image by E. Flaño (ULE).

Simple tubular glands

• Simple tubular glands: Gastric mucosa of rat. HE. x200.

Smooth muscle cells

• Simple columnar epithelium with striated border. HE. x1,260. Cat duodenum.
• Simple columnar epithelium with stereocilia. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.

Spaces left by lipid droplets

• Sebaceous gland. Human pilosebaceous skin. HE. x1,150.

Spinous layer

• Desmosomes between keratinocytes by light microscopy (HPI, x1,150) and TEM (x33,000).
• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Stereocilia tufts

• Simpl columnar epithelium with stereocilium tufts. Wolffian duct of Rainbow trout (O. mykiss). HE. x1,150.

Stomach lumen

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Stratified cuboidal mucous epithelium, keratin-positive

• Expression of cytokeratins in epithelial cells. Rainbow trout epidermis O. mykiss. Anti-pancytokeratin IP. x500.

Stratified squamous keratinized epithelium

• Stratified squamous keratinized epithelium: keratinization. HE. Human skin. x850.

Stratified squamous keratinized lingual epithelium

• Epithelial regeneration. Lieberkühn's crypts of cat (HE, x580), human hair bulb (HE, x390), and cat taste papilla (HE, x370).
• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Striated border

• Simple columnar epithelium with striated border and goblet cells. HE and Alcian Blue. x1,150. Cat duodenum.
• Simple columnar epithelium with striated border. HE-PAS. x1,150. Rat intestinal villus.
• Simple columnar epithelium with striated border. HE. x1,260. Cat duodenum.

Striated border with PAS-positive glycocalyx

• Simple columnar lining epithelium with striated border. Intestinal villi of rat. HE-PAS. x1,150.

Striated excretory duct lumina

• Lining epithelium with basal striation. Interlobular striated excretory ducts of rat salivary gland. TrG. x1,150.

Striated interlobular duct

• Serous and mucous adenomeres (mixed gland). Developing submandibular salivary gland of rat. TrG. x1,150.

Striated basal pole

• Striated basal pole. TEM. Distal urinary tubule cell of rat kidney. (Image under licence Creative Commons Public Domain Mark 1.0 from Amano, O. et al., 2012: Acta Histochem Cytochem, 45: 241–250).

Submesothelial connective tissue

• Mesothelium. Porcine liver. Trichrome stain. x950.

Submucosa (loose connective tissue)

• Transitional epithelium. Non-distended urinary bladder of cat. HE. x460.

Superficial mucosecreting cells

• Stratified cuboidal lining epithelium, mucosecretory. Skin of Myxine glutinosa. HE and HPI-Alz. Blue. x230.

Taste buds

• Epithelial regeneration. Lieberkühn's crypts in cat (HE, x580), human hair follicle (HE, x390), and cat taste bud (HE, x370).
• Sensory epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

Taste sensory cells

• Sensorial epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).

TEM of enteroendocrine LG cell

• Enteroendocrine cells. Gastrin-secreting G cell. IP anti-G, human stomach. x450. LG (secretin-secreting) cell, human duodenum. TEM. x5,400. Images by Afonso Barbosa, JA, 2017. Gastric Cancer. http://dx.doi.org/10.5772/intechopen.69722 (licensed under CC BY 3.0), and by Pearse AGE et al., 1970. Gut 11: 649-658 (licensed by BMJ Publishing Group Ltd).

Terminal bar

• Terminal bar: junction complex (oblique section). TEM. x16,300.

Terminal web

• Ordered microvilli (brush border). Intestinal epithelium of rat. TEM. x20,000 (J. Vaquera, ULE)

Thyroid follicles

• Endocrine follicles. Rat thyroid gland. HE. x450.

Tight junction

• Glycocalyx and tight junction: Pharyngeal epithelium of trout O. mykiss. Ruthenium Red staining. x80,000.
• Terminal bar: tight junction complex (oblique section). TEM. x16,300.

Tonofilaments

• Hemidesmosomes in an epithelial cell. Mouse trachea. TEM.

Transcytosis vesicles

• Intercellular gap junction. Mesothelium of the jugular body of Rana temporaria. TEM. x37,000.

Transitional epithelium (folded)

• Transitional epithelium. Non-distended urinary bladder of cat. HE. x460.

Tracheal epithelial cell

• Hemidesmosomes in an epithelial cell. Mouse trachea. TEM.

Tubules and cisterns of the tubulo-vesicular system

• Intracellular canaliculi of parietal (oxyntic) cells. Stomach of European beaver, Castor fiber. TEM. x7,300 (left) and x5,800. (images by Ziółkowska, N., et al., 2014. PLoS ONE: e94590. doi:10.1371/journal.pone.0094590, licensed under Creative Commons Attribution 4.0).

Tubuloacinar serous adenomeres (CL)

• Tubuloacinar serous adenomeres. Exocrine pancreas of cat. HE. 550x.

Typhlosole lumen

• Simple ciliated mucous-secretory columnar lining epithelium Dorsal typhlosole epithelium of Lumbricus terrestris. HPI-Al. Blue. x1,150.

Unicellular mucous glands

• Cytokeratin expression in epithelial cells. Epidermis of Rainbow trout O. mykiss. IP anti-pankeratin. x500.
• Lateral labyrinth of unicellular mucous glands. Epidermis of Pelophylax perezi.
• Mucous unicellular glands. Epidermis of Rainbow trout. HE. x500
• Mucous unicellular glands. Epidermis of Salmo trutta fario. HE-PAS. x750.
• Mucous unicellular glands. Gill epithelium of Rutilus rutilus. TEM. x8,000
• Simple epithelium with non-chitinous fibrous cuticle. Skin of Lumbricus terrestris. Van Gieson. x1,150.
• Stratified cuboidal lining epithelium, mucosecretory. Skin of Myxine glutinosa. HE and HPI-Al. Blue. x230.

Urinary bladder lumen

• Transitional epithelium. Non-distended urinary bladder of cat. HE. x460.

Vein

• Endothelium. HE. x1,150. Vein of Rainbow trout (O. mykiss).

Venules

• Pseudostratified ciliated epithelium. Nasal epithelium of frog (P. perezi). HPI-Alz. Blue. x1,150.
• Serous tubuloacinar adenomeres. Exocrine pancreas of cat. HE. x550.
• Simple columnar epithelium with closed mucosal pole. Superficial gastric mucosa of toad (Bufo bufo) x1,150.

Vestibular sensory cells

• Sensorial epithelial cells: nasal epithelium (HPI, x1,000); Epidermal ridge (HE, x780); Taste buds (HE, x650); Ampullary crest (HE, x680).